EP2516812A1 - Exhaust system for a vehicle having a "stop- start" compression ignition engine - Google Patents

Exhaust system for a vehicle having a "stop- start" compression ignition engine

Info

Publication number
EP2516812A1
EP2516812A1 EP10801251A EP10801251A EP2516812A1 EP 2516812 A1 EP2516812 A1 EP 2516812A1 EP 10801251 A EP10801251 A EP 10801251A EP 10801251 A EP10801251 A EP 10801251A EP 2516812 A1 EP2516812 A1 EP 2516812A1
Authority
EP
European Patent Office
Prior art keywords
washcoat
zone
vehicle according
upstream
precious metal
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP10801251A
Other languages
German (de)
French (fr)
Other versions
EP2516812B1 (en
Inventor
David Bergeal
Paul Richard Phillips
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Johnson Matthey PLC
Original Assignee
Johnson Matthey PLC
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Filing date
Publication date
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Application filed by Johnson Matthey PLC filed Critical Johnson Matthey PLC
Publication of EP2516812A1 publication Critical patent/EP2516812A1/en
Application granted granted Critical
Publication of EP2516812B1 publication Critical patent/EP2516812B1/en
Active legal-status Critical Current
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
    • F01N3/24—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by constructional aspects of converting apparatus
    • F01N3/28—Construction of catalytic reactors
    • F01N3/2803—Construction of catalytic reactors characterised by structure, by material or by manufacturing of catalyst support
    • F01N3/2825—Ceramics
    • F01N3/2828—Ceramic multi-channel monoliths, e.g. honeycombs
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/34—Chemical or biological purification of waste gases
    • B01D53/92—Chemical or biological purification of waste gases of engine exhaust gases
    • B01D53/94—Chemical or biological purification of waste gases of engine exhaust gases by catalytic processes
    • B01D53/9445—Simultaneously removing carbon monoxide, hydrocarbons or nitrogen oxides making use of three-way catalysts [TWC] or four-way-catalysts [FWC]
    • B01D53/945—Simultaneously removing carbon monoxide, hydrocarbons or nitrogen oxides making use of three-way catalysts [TWC] or four-way-catalysts [FWC] characterised by a specific catalyst
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J23/00—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00
    • B01J23/38—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of noble metals
    • B01J23/40—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of noble metals of the platinum group metals
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J23/00—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00
    • B01J23/38—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of noble metals
    • B01J23/40—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of noble metals of the platinum group metals
    • B01J23/44—Palladium
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J23/00—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00
    • B01J23/38—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of noble metals
    • B01J23/48—Silver or gold
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J23/00—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00
    • B01J23/38—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of noble metals
    • B01J23/54—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of noble metals combined with metals, oxides or hydroxides provided for in groups B01J23/02 - B01J23/36
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J23/00—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00
    • B01J23/38—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of noble metals
    • B01J23/54—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of noble metals combined with metals, oxides or hydroxides provided for in groups B01J23/02 - B01J23/36
    • B01J23/66—Silver or gold
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J35/00—Catalysts, in general, characterised by their form or physical properties
    • B01J35/19—Catalysts containing parts with different compositions
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/0807—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by using absorbents or adsorbents
    • F01N3/0814—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by using absorbents or adsorbents combined with catalytic converters, e.g. NOx absorption/storage reduction catalysts
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
    • F01N3/24—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by constructional aspects of converting apparatus
    • F01N3/28—Construction of catalytic reactors
    • F01N3/2803—Construction of catalytic reactors characterised by structure, by material or by manufacturing of catalyst support
    • F01N3/2807—Metal other than sintered metal
    • F01N3/281—Metallic honeycomb monoliths made of stacked or rolled sheets, foils or plates
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2330/00—Structure of catalyst support or particle filter
    • F01N2330/60—Discontinuous, uneven properties of filter material, e.g. different material thickness along the longitudinal direction; Higher filter capacity upstream than downstream in same housing
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2510/00—Surface coverings
    • F01N2510/06—Surface coverings for exhaust purification, e.g. catalytic reaction
    • F01N2510/068—Surface coverings for exhaust purification, e.g. catalytic reaction characterised by the distribution of the catalytic coatings
    • F01N2510/0682—Surface coverings for exhaust purification, e.g. catalytic reaction characterised by the distribution of the catalytic coatings having a discontinuous, uneven or partially overlapping coating of catalytic material, e.g. higher amount of material upstream than downstream or vice versa
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02N—STARTING OF COMBUSTION ENGINES; STARTING AIDS FOR SUCH ENGINES, NOT OTHERWISE PROVIDED FOR
    • F02N11/00—Starting of engines by means of electric motors
    • F02N11/08—Circuits or control means specially adapted for starting of engines
    • F02N11/0814—Circuits or control means specially adapted for starting of engines comprising means for controlling automatic idle-start-stop
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
    • Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters

Definitions

  • the present invention relates to an exhaust system for a vehicular compression ignition internal combustion engine, such as a Diesel engine, and in particular it relates to an exhaust system for a vehicle comprising a so-called engine "stop-start" system.
  • stop-start Amongst the strategies being adopted to improve both fuel consumption and emissions for both gasoline spark ignition engines and compression ignition (e.g. Diesel) engines is "stop-start".
  • stop-start when the vehicle halts for more than a few seconds, the engine is stopped entirely.
  • driver needs to move off once more, e.g. depressing the clutch, moving the gear stick, turning the powered steering wheel or, in automatic or semi-automatic vehicles, shifting to "drive”, causes the engine to be re-started. Although this causes more load on the battery and starter motor, so that these need to be upgraded, there can be significant savings.
  • the savings in tests under the New European Drive Cycle may, depending on the stop-start system adopted, be of the order of up to 5% of fuel consumption and up to 8% of C0 2 emissions.
  • Urban authorities are keen on reducing emissions in towns and cities, and from heavy traffic, so it is likely that stop-start systems will be included in many new vehicles.
  • Light duty Diesel engines are becoming even more efficient, with electronic control modules and injection technology being combined with mechanical improvements. This means that the exhaust gas temperatures are very much lower than with gasoline engines or heavy duty (truck and bus) diesel engines. Under light load, for example in urban use, and when “coasting" in gear, little or no fuel is being used by such latest design light duty Diesel engines, and the exhaust gas temperatures may be no greater than about 100-200°C. Despite these low temperatures, advanced catalyst technology can achieve light-off during the New European Drive Cycle, during real-life city driving conditions, low-speed accelerations and steady driving conditions. "Light-off may be defined as the temperature at which a catalyst catalyses a reaction at a desired conversion activity.
  • CO Tso is a temperature at which a particular catalyst causes the conversion of carbon monoxide in a feed gas, for example to C0 2 , with at least 50% efficiency.
  • HC T 8 o is the temperature at which hydrocarbon, perhaps a particular hydrocarbon such as octane or propene, is converted, e.g. to water vapour and to C0 2 at 80% efficiency or greater.
  • DOC Diesel Oxidation Catalyst
  • One known DOC design is disclosed in our WO 2007/077462 and comprises a flow-through monolith comprising (numbering from upstream to downstream) first, second and third platinum-group metal-containing washcoat zones.
  • the platinum group metal loading in each of the first and third zones is greater than in the second zone, which is spatially disposed between the first and third zones.
  • the third zone that is the zone which, when in use, is disposed furthest from the engine, may include a washcoat having a higher thermal mass than the first and second zones, for example by using a thicker washcoat or a washcoat material having an inherently higher thermal mass, such as densified zirconia. Densified zirconia can have a density of 3.5 g/cm 3 .
  • the three-zone arrangement is designed to maintain catalyst performance at an overall reduced total platinum group metal cost. Relative to conventional Diesel engines that remain running at idle, there is generally less variation in catalyst temperature over a drive cycle for a vehicular Diesel engine fitted with "stop/start” technology because the catalyst is not cooled at idle by contact with relatively cool exhaust gas.
  • the inventors have now devised a Diesel Oxidation Catalyst having improved activity for use in treating exhaust gas from Diesel vehicles fitted with such "stop/start” technology.
  • the inventors have devised an arrangement that balances the competing demands of low catalyst light-off temperature to treat cold-start emissions as quickly as possible, with "light out” where a catalyst may fall below a desired activity during cooler periods of the drive cycle after the catalyst has already “lit-off” following cold-start.
  • the present invention provides a vehicle comprising a compression ignition engine provided with engine management means and having a catalyst for exhaust gas aftertreatment, wherein the engine management means is configured, when in use, to detect idle conditions and upon determining that idle conditions exist, stops the engine entirely, wherein the catalyst comprises a honeycomb substrate monolith coated with a catalytic washcoat comprising one or more precious metal, which catalytic washcoat being arranged between a first, upstream washcoat zone and a second, downstream washcoat zone, wherein the thermal mass in the first washcoat zone is different from a thermal mass in the second washcoat zone and wherein a washcoat layer in the first, upstream washcoat zone is substantially contiguous with a washcoat layer in the second, downstream washcoat zone.
  • the preferred compression ignition engine is powered by Diesel fuel, but other forms of fuel are also possible including natural gas (NG) and blends of Diesel and biofuel or Fischer-Tropsch process derived fuels.
  • NG natural gas
  • the honeycomb substrate monolith can be made from a ceramic material such as cordierite or silicon carbide, or a metal such as FecralloyTM.
  • the arrangement is preferably a so-called flow-through configuration, in which a plurality of channels extend in parallel from an open inlet end to an open outlet end.
  • the honeycomb substrate monolith may also take the form of a filtering substrate such as a so-called wall- flow filter or a ceramic foam.
  • the thermal mass in the first, upstream washcoat zone is greater than the thermal mass in the second, downstream washcoat zone.
  • the thermal mass in the first, upstream washcoat zone is less than the thermal mass in the second, downstream washcoat zone.
  • the honeycomb substrate monolith has a total length.
  • the first, upstream washcoat zone is defined at an upstream end by an inlet end of the honeycomb substrate monolith and at a downstream end by point between 10% and 90%, optionally between 15% and 80% such as between 20% and 30% or 20%> and 40%>, of the total length of the substrate monolith measured from the inlet end.
  • the length of the inlet zone ⁇ the length of the outlet zone.
  • a desirable feature of a low washcoat loading is that its relatively low thermal mass enables it to heat up more quickly and hence to "light-off more efficiently following cold- start.
  • the catalyst can also cool down more quickly and in this regard “lighting-out” in the middle of a drive cycle after initially warming up (i.e. post-"light-of ') is an undesirable feature.
  • Higher washcoat loadings have the advantage that there is more support material present to support precious metal, and higher precious metal dispersions are possible.
  • the higher washcoat loading can provide greater resistance to thermal ageing in use, i.e. higher thermal durability.
  • the different thermal mass in the first or second zone relative from the second or first zone respectively is provided by a thicker washcoat layer than is used in the other zone.
  • a washcoat loading in the thicker washcoat layer may be 4 to 10 gin "3 , such as from 5 to 8 gin "3 .
  • a washcoat loading in the relatively thinner washcoat layer can be from 1 to 3.5 gin "3 , such as from 2 to 3 gin "3 .
  • the different thermal mass in the first or second zone relative from the second or first zone respectively may be provided by a washcoat component having a density of at least 3.50 gem "3 .
  • Materials having the suitable density may be selected from the group consisting of densified alpha alumina, densified lanthana, densified cerium II oxide, densified cerium III oxide and densified zirconia.
  • a total precious metal loading, measured as unit weight of precious metal per unit volume of washcoat, in the first, upstream washcoat zone is greater than a total precious metal loading in the second, downstream washcoat zone.
  • the first, upstream washcoat zone comprises 55 to 90% of a total precious metal loading of the honeycomb substrate monolith. In another embodiment, the first, upstream washcoat zone comprises 60 to 80% of the total precious metal loading of the honeycomb substrate monolith.
  • a total precious loading on the honeycomb substrate monolith can be from 15 to 300 gft -3 , such as from 30 to 150 gft "3 , e.g. 40 to 120 gft "3 .
  • Precious metals for use in the present invention include one or more selected from platinum, palladium, rhodium, gold, silver or mixtures of any two or more thereof.
  • a preferred embodiment subset of precious metals for use in the present invention is the platinum group metals.
  • precious metals include platinum per se, palladium per se, a mixture of both platinum and palladium (optionally present as an alloy) or a combination of palladium and gold, either as a mixture, an alloy or both a mixture and an alloy.
  • the precious metal or combination of precious metals in the first, upstream zone is different from the precious metal or combination of precious metals in the second, downstream zone.
  • the or each precious metal is supported on a high surface area refractory oxide component.
  • Suitable precious metal support components include alumina, silica, amorphous alumino silicates, molecular sieves such as aluminosilicate zeolites, titania, magnesia, magnesium aluminate, ceria, zirconia etc. and mixtures, composite oxides and mixed oxides of any two or more thereof, optionally stabilised with one or more rare earth elements.
  • Particularly preferred mixed oxides include ceria-zirconia, which (depending on the content of ceria) may also include one or more rare earth metals, and alumina doped with silica.
  • the catalyst for use in the present invention can be located at any convenient point on the vehicle, taking account of packaging and space constraints on the vehicle. Common locations are in the close-coupled location as close to the engine exhaust manifold as possible to take advantage of the hottest possible exhaust gas temperatures. Common alternative locations include the so-called "underfloor" position.
  • Figure 1 is a graph comparing the computer modelled mass flow, close- coupled DOC inlet temperature, carbon monoxide and hydrocarbon content of exhaust gas from a 2.4 litre Euro IV bench-mounted vehicular Diesel engine run over the MVEG-B European drive cycle plotted against time.
  • Example 1 represents the results of a computer model, wherein a cylindrical 400 cells per square inch cordierite flow-through honeycomb monolith substrate having dimensions 143 x 98 x 135 mm and a volume of 1.50L is coated throughout with an homogeneous Diesel Oxidation Catalyst washcoat layer of low (2.5gin ⁇ 3 ) or high (7.0gin ⁇ 3 ) washcoat loading and a uniform platinum loading (Comparative Example). Zoned Diesel Oxidation Catalysts according to the invention were prepared using the same bare honeycomb substrate monolith and are shown in Table 1.
  • Methods of preparing zoned honeycomb substrate monoliths include the Applicant's WO 99/47260, i.e. comprising the steps of (a) locating a containment means on top of a support, (b) dosing a pre-determined quantity of a liquid component into said containment means, either in the order (a) then (b) or (b) then (a), and (c) by applying pressure or vacuum, drawing said liquid component into at least a portion of the support, and retaining substantially all of said quantity within the support.
  • the percentage figures shown in the "washcoat loading” column of Table 1 represent the length of the first, upstream zone (far left-hand column) and second, downstream zone relative to the total substrate length as measured from the inlet end of the substrate monolith.
  • the “Pt loading” column represents the platinum metal loading in the first, upstream zone (left-hand column) and the second, downstream zone from left to right, respectively.
  • the CO(g) and HC(g) figures are for carbon monoxide and hydrocarbon present measured at the outlet to the Diesel Oxidation Catalyst.
  • the "Normalised CO(g) Conversion” and “Normalised HC(g) Conversion” is relative to the homogeneously coated low washcoat loaded, 40gft ⁇ 3 (Comparative Example 2). The total platinum content in all of the Examples was constant.
  • Example 4 An improvement in CO oxidation was obtained where the upstream half of the substrate monolith was coated with a low washcoat loading while the downstream half remained coated with a high washcoat loading (Example 3), without adjusting the relative platinum metal loadings between the zones.
  • Example 4 the reverse arrangement of this configuration (wherein the upstream 50% zone is high washcoat loaded and the downstream half is low washcoat loaded (i.e. Example 4)) gives worse activity than the control.
  • the vehicle tested has a particularly cold-running engine and the inventors still believe that the configuration of Example 4 may be particularly useful for a vehicle having an engine that runs hotter (the product offerings of different vehicle manufacturers can vary in MVEG-B on-cycle exhaust gas temperature).
  • Example 4 configuration is still regarded as falling within the scope of the present invention.
  • the remaining results shown in Table 1 concentrate on configurations featuring a low loaded upstream zone but varying the length and platinum metal loading of the upstream zone.
  • Example 5 By shortening the length of the upstream low washcoat loaded zone to 25% (Example 5), a further improvement in CO oxidation is obtained over the Example 4 configuration.
  • the remaining embodiments (Examples 6-8 inclusive) retained the 25% length inlet zone low washcoat loading/75% length outlet zone high washcoat loading arrangement and investigated changing the platinum metal loading split between the two zones.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Organic Chemistry (AREA)
  • Materials Engineering (AREA)
  • Combustion & Propulsion (AREA)
  • Health & Medical Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Ceramic Engineering (AREA)
  • Toxicology (AREA)
  • Biomedical Technology (AREA)
  • Environmental & Geological Engineering (AREA)
  • Analytical Chemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Exhaust Gas After Treatment (AREA)
  • Catalysts (AREA)

Abstract

A vehicle comprises a compression ignition engine provided with engine management means and having a catalyst for exhaust gas after treatment, wherein the engine management means is configured, when in use, to detect idle conditions and upon determining that idle conditions exist, stops the engine entirely, wherein the catalyst comprises a honeycomb substrate monolith coated with a catalytic washcoat comprising one or more precious metal, which catalytic washcoat being arranged between a first, upstream washcoat zone and a second, downstream washcoat zone, wherein a thermal mass in the first washcoat zone is different from a thermal mass in the second washcoat zone and wherein a washcoat layer in the first, upstream washcoat zone is substantially contiguous with a washcoat layer in the second, downstream washcoat zone.

Description

EXHAUST SYSTEM FOR A VEHICLE HAVING A "STOP-START"
COMPRESSION IGNITION ENGINE
The present invention relates to an exhaust system for a vehicular compression ignition internal combustion engine, such as a Diesel engine, and in particular it relates to an exhaust system for a vehicle comprising a so-called engine "stop-start" system.
The emissions from vehicles and internal combustion engines generally are the subject of ever-tightening regulation around the world. Concern about global warming associated with C02 emissions has led to fiscal incentives in a number of countries to reduce C02 emissions from vehicles. Increasingly, therefore, private cars and light commercial vehicles are being powered by light duty diesel engines, which have relatively low fuel consumption and relatively low C02 emissions.
Amongst the strategies being adopted to improve both fuel consumption and emissions for both gasoline spark ignition engines and compression ignition (e.g. Diesel) engines is "stop-start". With a stop-start system, when the vehicle halts for more than a few seconds, the engine is stopped entirely. When the driver needs to move off once more, e.g. depressing the clutch, moving the gear stick, turning the powered steering wheel or, in automatic or semi-automatic vehicles, shifting to "drive", causes the engine to be re-started. Although this causes more load on the battery and starter motor, so that these need to be upgraded, there can be significant savings. The savings in tests under the New European Drive Cycle may, depending on the stop-start system adopted, be of the order of up to 5% of fuel consumption and up to 8% of C02 emissions. Urban authorities are keen on reducing emissions in towns and cities, and from heavy traffic, so it is likely that stop-start systems will be included in many new vehicles.
Light duty Diesel engines are becoming even more efficient, with electronic control modules and injection technology being combined with mechanical improvements. This means that the exhaust gas temperatures are very much lower than with gasoline engines or heavy duty (truck and bus) diesel engines. Under light load, for example in urban use, and when "coasting" in gear, little or no fuel is being used by such latest design light duty Diesel engines, and the exhaust gas temperatures may be no greater than about 100-200°C. Despite these low temperatures, advanced catalyst technology can achieve light-off during the New European Drive Cycle, during real-life city driving conditions, low-speed accelerations and steady driving conditions. "Light-off may be defined as the temperature at which a catalyst catalyses a reaction at a desired conversion activity. For example "CO Tso"is a temperature at which a particular catalyst causes the conversion of carbon monoxide in a feed gas, for example to C02, with at least 50% efficiency. Similarly, "HC T8o" is the temperature at which hydrocarbon, perhaps a particular hydrocarbon such as octane or propene, is converted, e.g. to water vapour and to C02 at 80% efficiency or greater.
However, under certain circumstances low exhaust gas temperatures can mean that the Diesel Oxidation Catalyst (DOC) may be unable to operate effectively. That is, the DOC may be unable to achieve or to maintain "light-off.
For vehicles not fitted with an engine "stop-start" system, an additional problem arising from operation of the engine under such light load conditions is that whilst the engine is operating, relatively cool exhaust gases, comprising mostly air, continue to pass from the engine through the DOC or other catalyst. This flow of cool gases can cool the DOC to below light-off temperatures. When load is reapplied, for example upon acceleration, the catalyst is unable to meet the desired conversion of the pollutant gases immediately, with the result that emissions of pollutants may be above the regulated levels for a period. In due course, the higher temperature exhaust gases raise the catalyst temperature above light-off temperature once more.
One known DOC design is disclosed in our WO 2007/077462 and comprises a flow-through monolith comprising (numbering from upstream to downstream) first, second and third platinum-group metal-containing washcoat zones. The platinum group metal loading in each of the first and third zones is greater than in the second zone, which is spatially disposed between the first and third zones. The third zone, that is the zone which, when in use, is disposed furthest from the engine, may include a washcoat having a higher thermal mass than the first and second zones, for example by using a thicker washcoat or a washcoat material having an inherently higher thermal mass, such as densified zirconia. Densified zirconia can have a density of 3.5 g/cm3. The three-zone arrangement is designed to maintain catalyst performance at an overall reduced total platinum group metal cost. Relative to conventional Diesel engines that remain running at idle, there is generally less variation in catalyst temperature over a drive cycle for a vehicular Diesel engine fitted with "stop/start" technology because the catalyst is not cooled at idle by contact with relatively cool exhaust gas. The inventors have now devised a Diesel Oxidation Catalyst having improved activity for use in treating exhaust gas from Diesel vehicles fitted with such "stop/start" technology. In particular, the inventors have devised an arrangement that balances the competing demands of low catalyst light-off temperature to treat cold-start emissions as quickly as possible, with "light out" where a catalyst may fall below a desired activity during cooler periods of the drive cycle after the catalyst has already "lit-off" following cold-start.
The present invention provides a vehicle comprising a compression ignition engine provided with engine management means and having a catalyst for exhaust gas aftertreatment, wherein the engine management means is configured, when in use, to detect idle conditions and upon determining that idle conditions exist, stops the engine entirely, wherein the catalyst comprises a honeycomb substrate monolith coated with a catalytic washcoat comprising one or more precious metal, which catalytic washcoat being arranged between a first, upstream washcoat zone and a second, downstream washcoat zone, wherein the thermal mass in the first washcoat zone is different from a thermal mass in the second washcoat zone and wherein a washcoat layer in the first, upstream washcoat zone is substantially contiguous with a washcoat layer in the second, downstream washcoat zone.
The preferred compression ignition engine is powered by Diesel fuel, but other forms of fuel are also possible including natural gas (NG) and blends of Diesel and biofuel or Fischer-Tropsch process derived fuels.
The honeycomb substrate monolith can be made from a ceramic material such as cordierite or silicon carbide, or a metal such as Fecralloy™. The arrangement is preferably a so-called flow-through configuration, in which a plurality of channels extend in parallel from an open inlet end to an open outlet end. However, the honeycomb substrate monolith may also take the form of a filtering substrate such as a so-called wall- flow filter or a ceramic foam. In one embodiment, the thermal mass in the first, upstream washcoat zone is greater than the thermal mass in the second, downstream washcoat zone. However, in a presently preferred embodiment, the thermal mass in the first, upstream washcoat zone is less than the thermal mass in the second, downstream washcoat zone. In either of the preceding embodiments, the honeycomb substrate monolith has a total length. In embodiments, the first, upstream washcoat zone is defined at an upstream end by an inlet end of the honeycomb substrate monolith and at a downstream end by point between 10% and 90%, optionally between 15% and 80% such as between 20% and 30% or 20%> and 40%>, of the total length of the substrate monolith measured from the inlet end. In preferred embodiments, the length of the inlet zone < the length of the outlet zone.
A desirable feature of a low washcoat loading is that its relatively low thermal mass enables it to heat up more quickly and hence to "light-off more efficiently following cold- start. However, because of the lower thermal mass, the catalyst can also cool down more quickly and in this regard "lighting-out" in the middle of a drive cycle after initially warming up (i.e. post-"light-of ') is an undesirable feature. Higher washcoat loadings have the advantage that there is more support material present to support precious metal, and higher precious metal dispersions are possible. The higher washcoat loading can provide greater resistance to thermal ageing in use, i.e. higher thermal durability.
In a particular embodiment, the different thermal mass in the first or second zone relative from the second or first zone respectively is provided by a thicker washcoat layer than is used in the other zone. In this embodiment, a washcoat loading in the thicker washcoat layer may be 4 to 10 gin"3, such as from 5 to 8 gin"3. Conversely, in the other zone a washcoat loading in the relatively thinner washcoat layer can be from 1 to 3.5 gin"3, such as from 2 to 3 gin"3. Alternatively, according to another embodiment, the different thermal mass in the first or second zone relative from the second or first zone respectively may be provided by a washcoat component having a density of at least 3.50 gem"3. Materials having the suitable density may be selected from the group consisting of densified alpha alumina, densified lanthana, densified cerium II oxide, densified cerium III oxide and densified zirconia.
In preferred embodiments, a total precious metal loading, measured as unit weight of precious metal per unit volume of washcoat, in the first, upstream washcoat zone is greater than a total precious metal loading in the second, downstream washcoat zone.
In one embodiment, for example, the first, upstream washcoat zone comprises 55 to 90% of a total precious metal loading of the honeycomb substrate monolith. In another embodiment, the first, upstream washcoat zone comprises 60 to 80% of the total precious metal loading of the honeycomb substrate monolith.
A total precious loading on the honeycomb substrate monolith can be from 15 to 300 gft-3, such as from 30 to 150 gft"3, e.g. 40 to 120 gft"3.
Precious metals for use in the present invention include one or more selected from platinum, palladium, rhodium, gold, silver or mixtures of any two or more thereof. A preferred embodiment subset of precious metals for use in the present invention is the platinum group metals.
Particularly preferred selections of precious metals include platinum per se, palladium per se, a mixture of both platinum and palladium (optionally present as an alloy) or a combination of palladium and gold, either as a mixture, an alloy or both a mixture and an alloy.
In a particular embodiment, the precious metal or combination of precious metals in the first, upstream zone is different from the precious metal or combination of precious metals in the second, downstream zone. Generally, the or each precious metal is supported on a high surface area refractory oxide component. Suitable precious metal support components include alumina, silica, amorphous alumino silicates, molecular sieves such as aluminosilicate zeolites, titania, magnesia, magnesium aluminate, ceria, zirconia etc. and mixtures, composite oxides and mixed oxides of any two or more thereof, optionally stabilised with one or more rare earth elements. Particularly preferred mixed oxides include ceria-zirconia, which (depending on the content of ceria) may also include one or more rare earth metals, and alumina doped with silica. The catalyst for use in the present invention can be located at any convenient point on the vehicle, taking account of packaging and space constraints on the vehicle. Common locations are in the close-coupled location as close to the engine exhaust manifold as possible to take advantage of the hottest possible exhaust gas temperatures. Common alternative locations include the so-called "underfloor" position.
In order that the invention may be more fully understood the following Examples are provided by way of illustration only and with reference to the accompanying drawings in which:
Figure 1 is a graph comparing the computer modelled mass flow, close- coupled DOC inlet temperature, carbon monoxide and hydrocarbon content of exhaust gas from a 2.4 litre Euro IV bench-mounted vehicular Diesel engine run over the MVEG-B European drive cycle plotted against time.
EXAMPLE
The following Example represents the results of a computer model, wherein a cylindrical 400 cells per square inch cordierite flow-through honeycomb monolith substrate having dimensions 143 x 98 x 135 mm and a volume of 1.50L is coated throughout with an homogeneous Diesel Oxidation Catalyst washcoat layer of low (2.5gin~3) or high (7.0gin~3) washcoat loading and a uniform platinum loading (Comparative Example). Zoned Diesel Oxidation Catalysts according to the invention were prepared using the same bare honeycomb substrate monolith and are shown in Table 1.
Methods of preparing zoned honeycomb substrate monoliths are known in the art and include the Applicant's WO 99/47260, i.e. comprising the steps of (a) locating a containment means on top of a support, (b) dosing a pre-determined quantity of a liquid component into said containment means, either in the order (a) then (b) or (b) then (a), and (c) by applying pressure or vacuum, drawing said liquid component into at least a portion of the support, and retaining substantially all of said quantity within the support.
The percentage figures shown in the "washcoat loading" column of Table 1 represent the length of the first, upstream zone (far left-hand column) and second, downstream zone relative to the total substrate length as measured from the inlet end of the substrate monolith. The "Pt loading" column represents the platinum metal loading in the first, upstream zone (left-hand column) and the second, downstream zone from left to right, respectively. The CO(g) and HC(g) figures are for carbon monoxide and hydrocarbon present measured at the outlet to the Diesel Oxidation Catalyst. The "Normalised CO(g) Conversion" and "Normalised HC(g) Conversion" is relative to the homogeneously coated low washcoat loaded, 40gft~3 (Comparative Example 2). The total platinum content in all of the Examples was constant.
The mass flow, temperature and engine-out carbon monoxide (CO(g)) and total hydrocarbon (HC(g)) content of the exhaust gas from the 2.4 litre Euro IV bench-mounted vehicular Diesel engine was recorded using a vehicle dynamometer fitted in the so-called close-coupled position as close to the engine exhaust manifold as practically possible (given the space constraints on the vehicle), and these data were used to construct the computer model using modelled catalyst configurations. Although the engine used was not fitted with "stop-start" technology, the effect of such a system was mimicked by turning off the engine whenever the MVEG-B European drive cycle reached idle. The results for mass flow, catalyst inlet temperature carbon monoxide (CO) and total hydrocarbon (THC) content in the exhaust gas is shown in Figure 1. The results are shown in Table 1, from which it can be seen that using the homogeneous high washcoat loading (Comparative Example 1) instead of the homogeneous low washcoat loading (Comparative Example 2) lowers the CO and HC conversion over the whole MVEG-B cycle. One plausible explanation for this result is that the catalyst is slower to light-off for CO and HC conversion at the start of the test because of the increased thermal mass of the catalyst.
Table 1
An improvement in CO oxidation was obtained where the upstream half of the substrate monolith was coated with a low washcoat loading while the downstream half remained coated with a high washcoat loading (Example 3), without adjusting the relative platinum metal loadings between the zones. For the vehicle tested, the reverse arrangement of this configuration (wherein the upstream 50% zone is high washcoat loaded and the downstream half is low washcoat loaded (i.e. Example 4)) gives worse activity than the control. However, the vehicle tested has a particularly cold-running engine and the inventors still believe that the configuration of Example 4 may be particularly useful for a vehicle having an engine that runs hotter (the product offerings of different vehicle manufacturers can vary in MVEG-B on-cycle exhaust gas temperature). Hence, the Example 4 configuration is still regarded as falling within the scope of the present invention. However, the remaining results shown in Table 1 (i.e. for Examples 5-8 inclusive) concentrate on configurations featuring a low loaded upstream zone but varying the length and platinum metal loading of the upstream zone.
It can be seen that by shortening the length of the upstream low washcoat loaded zone to 25% (Example 5), a further improvement in CO oxidation is obtained over the Example 4 configuration. The remaining embodiments (Examples 6-8 inclusive) retained the 25% length inlet zone low washcoat loading/75% length outlet zone high washcoat loading arrangement and investigated changing the platinum metal loading split between the two zones.
A higher (100g/ft3) inlet zone platinum loading relative to a lower (20g/ft3) outlet zone platinum loading gave an improved CO conversion, but slightly poorer HC conversion than the homogeneous loaded embodiment (see results in Table 1 for Example 6). However, further iterations of the platinum split (70g/ft3 upstream zone/30g/ft3 downstream zone (Example 7); and 85g/ft3 upstream zone/25g/ft3 downstream zone (Example 8)) gave similar HC conversion results to those of the homogeneously loaded catalyst but surprisingly improved the CO conversion relative to the higher PGM loaded upstream zone embodiment (i.e. the 100g/ft3 upstream zone embodiment).
For the avoidance of any doubt, the entire contents of documents cited herein are incorporated herein by reference.

Claims

CLAIMS:
1. A vehicle comprising a compression ignition engine provided with engine management means and having a catalyst for exhaust gas aftertreatment, wherein the engine management means is configured, when in use, to detect idle conditions and upon determining that idle conditions exist, stops the engine entirely, wherein the catalyst comprises a honeycomb substrate monolith coated with a catalytic washcoat comprising one or more precious metal, which catalytic washcoat being arranged between a first, upstream washcoat zone and a second, downstream washcoat zone, wherein a thermal mass in the first washcoat zone is different from a thermal mass in the second washcoat zone and wherein a washcoat layer in the first, upstream washcoat zone is substantially contiguous with a washcoat layer in the second, downstream washcoat zone.
2. A vehicle according to claim 1, wherein the thermal mass in the first, upstream washcoat zone is greater than the thermal mass in the second, downstream washcoat zone.
3. A vehicle according to claim 1, wherein the thermal mass in the first, upstream washcoat zone is less than the thermal mass in the second, downstream washcoat zone.
4. A vehicle according to claim 1, 2 or 3, wherein the honeycomb substrate monolith has a total length, wherein the first, upstream washcoat zone is defined at an upstream end by an inlet end of the honeycomb substrate monolith and at a downstream end by point between 10% and 90% of the total length of the substrate monolith measured from the inlet end.
5. A vehicle according to any preceding claim, wherein the different thermal mass in the first or second zone relative to the second or first zone respectively is provided by a thicker washcoat layer than is used in the other zone.
6. A vehicle according to claim 5, wherein the thicker washcoat layer is provided by a washcoat loading of from 4 to 10 gin"3.
7. A vehicle according to claim 5 or 6, wherein a relatively thinner washcoat layer in the other zone has a washcoat loading of from 1 to 3.5 gin"3.
8. A vehicle according to any of claims 1 to 4, wherein the different thermal mass in the first or second zone relative to the second or first zone respectively is provided by a washcoat component having a density of at least 3.50 gem"3.
9. A vehicle according to claim 8, wherein the washcoat component is selected from the group consisting of densified alpha alumina, densified lanthana, densified cerium II oxide, densified cerium III oxide and densified zirconia.
10. A vehicle according to any preceding claim, wherein a total precious metal loading in the first, upstream washcoat zone measured as unit weight of precious metal per unit volume of washcoat is greater than a total precious metal loading in the second, downstream washcoat zone.
11. A vehicle according to claim 10, wherein the first, upstream washcoat zone comprises 55 to 90% of a total precious metal loading of the honeycomb substrate monolith.
12. A vehicle according to any preceding claim, wherein a total precious metal loading on the honeycomb substrate monolith is from 15 to 300 gft"3.
13. A vehicle according to any preceding claim, wherein the one or more precious metal is selected from the group consisting of platinum, palladium, rhodium, gold, silver and mixtures of any two or more thereof.
14. A vehicle according to claim 13, wherein the precious metal is platinum, palladium, a mixture of platinum and palladium or a combination of palladium and gold.
15. A vehicle according to claim 13 or 14, wherein the precious metal or combination of precious metals in the first, upstream zone is different from the precious metal or combination of precious metals in the second, downstream zone.
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Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2011061321A1 (en) * 2009-11-20 2011-05-26 Basf Se Zoned catalyzed soot filter
GB201220912D0 (en) * 2012-11-21 2013-01-02 Johnson Matthey Plc Oxidation catalyst for treating the exhaust gas of a compression ignition engine
US9266092B2 (en) 2013-01-24 2016-02-23 Basf Corporation Automotive catalyst composites having a two-metal layer
US9932876B2 (en) 2015-11-11 2018-04-03 Ford Global Technologies, Llc Systems and method for exhaust warm-up strategy
US11161098B2 (en) * 2018-05-18 2021-11-02 Umicore Ag & Co. Kg Three-way catalyst
GB2581776B (en) * 2019-02-19 2022-08-17 Jaguar Land Rover Ltd Catalytic converter core having first and second regions with different thermal inertia
US11624333B2 (en) 2021-04-20 2023-04-11 Kohler Co. Exhaust safety system for an engine

Family Cites Families (42)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1992009848A1 (en) * 1990-11-26 1992-06-11 Catalytica, Inc. Palladium partial combustion catalysts and a process for using them
US5258349A (en) * 1990-11-26 1993-11-02 Catalytica, Inc. Graded palladium-containing partial combustion catalyst
JPH08103656A (en) 1994-10-06 1996-04-23 N E Chemcat Corp Catalyst for purification of exhaust gas and method therefor
US5510086A (en) * 1995-04-10 1996-04-23 General Motors Corporation Adcat exhaust treatment device
US6087298A (en) * 1996-05-14 2000-07-11 Engelhard Corporation Exhaust gas treatment system
GB9805815D0 (en) 1998-03-19 1998-05-13 Johnson Matthey Plc Manufacturing process
AU3381899A (en) * 1998-04-28 1999-11-16 Engelhard Corporation Monolithic catalysts and related process for manufacture
DE19820971A1 (en) * 1998-05-12 1999-11-18 Emitec Emissionstechnologie Catalytic converter for purifying the exhaust gas from an I.C. engine
US6375910B1 (en) * 1999-04-02 2002-04-23 Engelhard Corporation Multi-zoned catalytic trap and methods of making and using the same
GB0003405D0 (en) 2000-02-15 2000-04-05 Johnson Matthey Plc Improvements in emissions control
DE10046278A1 (en) * 2000-09-19 2002-03-28 Emitec Emissionstechnologie Long life catalyst substrate, for purification of engine exhaust, has initial protective zone with greater thermal capacity per unit area, than another protective zone downstream
DE10161850B4 (en) 2001-12-15 2010-03-04 Daimler Ag Method for operating an internal combustion engine of a motor vehicle
DE10218348B4 (en) * 2002-04-25 2006-08-03 Bayerische Motoren Werke Ag Stop-start device for a motor vehicle with automatic transmission
US7118717B2 (en) * 2002-09-06 2006-10-10 Engelhard Corporation Simplified article for carbon monoxide removal
KR101225517B1 (en) * 2002-09-13 2013-01-23 존슨 맛쎄이 퍼블릭 리미티드 컴파니 Compression ignition engine and exhaust system therefor
JP4163926B2 (en) 2002-10-09 2008-10-08 日野自動車株式会社 Exhaust white smoke prevention device
GB0304939D0 (en) 2003-03-05 2003-04-09 Johnson Matthey Plc Light-duty diesel engine and a particulate filter therefor
KR20030031074A (en) 2003-03-25 2003-04-18 김성수 Method for controlling idle-stop of a car
DE10333603B4 (en) 2003-07-24 2012-01-05 Daimler Ag Device with a unit for actuating a stop / start unit
JP4333289B2 (en) 2003-09-03 2009-09-16 いすゞ自動車株式会社 Exhaust gas purification system
JP2005177571A (en) * 2003-12-17 2005-07-07 Nissan Motor Co Ltd Catalyst for trapping hc
JP4228971B2 (en) * 2004-04-06 2009-02-25 トヨタ自動車株式会社 Vehicle stop and start device
GB2416717B8 (en) 2004-07-29 2009-11-11 Ford Global Tech Llc A method for regenerating an exhaust treatment device
JP4363331B2 (en) * 2005-01-17 2009-11-11 トヨタ自動車株式会社 Fuel injection system
JP4513629B2 (en) * 2005-03-29 2010-07-28 トヨタ自動車株式会社 Vehicle control device
GB2427655B (en) 2005-06-29 2008-01-30 Ford Global Tech Llc A motor vehicle having a stop-start system
JP5021188B2 (en) * 2005-08-01 2012-09-05 株式会社キャタラー Exhaust gas purification catalyst
GB0600130D0 (en) * 2006-01-06 2006-02-15 Johnson Matthey Plc Exhaust system comprising zoned oxidation catalyst
US7740809B2 (en) * 2006-02-15 2010-06-22 Hitachi Metals, Ltd. Exhaust gas-cleaning apparatus
JP4635913B2 (en) * 2006-03-06 2011-02-23 日産自動車株式会社 Engine exhaust purification system
US7722827B2 (en) * 2006-03-31 2010-05-25 Corning Incorporated Catalytic flow-through fast light off ceramic substrate and method of manufacture
US7758834B2 (en) * 2006-08-21 2010-07-20 Basf Corporation Layered catalyst composite
GB0618482D0 (en) 2006-09-20 2006-11-01 Johnson Matthey Plc Washcoated particulate filter substrate
FR2906483B1 (en) * 2006-09-29 2009-06-05 Peugeot Citroen Automobiles Sa MONOLITHIC SUPPORT FOR OXIDATION CATALYST ELEMENT, OXIDATION CATALYST ELEMENT COMPRISING IT, EXHAUST LINE EQUIPPED AND VEHICLE COMPRISING IT.
WO2008126321A1 (en) * 2007-03-30 2008-10-23 Ibiden Co., Ltd. Exhaust gas purification system
US7802420B2 (en) 2007-07-26 2010-09-28 Eaton Corporation Catalyst composition and structure for a diesel-fueled autothermal reformer placed in and exhaust stream
US9993771B2 (en) 2007-12-12 2018-06-12 Basf Corporation Emission treatment catalysts, systems and methods
DE102007060019B3 (en) 2007-12-13 2009-04-23 Continental Automotive Gmbh Internal combustion engine e.g. petrol engine, controlling method for motor vehicle, involves reducing torque produced by engine such that rotational speed of engine is lowered, and stopping fuel injection, if condition is satisfied
KR20090107359A (en) * 2008-04-08 2009-10-13 현대자동차주식회사 Idle stop and go system and control method thereof
KR100916792B1 (en) * 2008-04-17 2009-09-14 현대자동차주식회사 Regeneration system for emission reduce line of diesel vehicle and method thereof
JP2009285605A (en) * 2008-05-30 2009-12-10 Toyota Motor Corp Catalyst for cleaning exhaust gas
WO2011061321A1 (en) * 2009-11-20 2011-05-26 Basf Se Zoned catalyzed soot filter

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2011077125A1 *

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JP5963202B2 (en) 2016-08-03
CN102762831A (en) 2012-10-31

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